// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_RENDERER_ANDROID_CONTENT_DETECTOR_H_
#define CONTENT_RENDERER_ANDROID_CONTENT_DETECTOR_H_

#include <stddef.h>

#include "base/macros.h"
#include "third_party/WebKit/public/platform/WebURL.h"
#include "url/gurl.h"

namespace blink {
class WebHitTestResult;
}

namespace content {

// Base class for text-based content detectors.
class ContentDetector {
public:
    virtual ~ContentDetector() { }

    // Returns an intent URL for the content around the hit_test.
    // If no content is found, an empty URL will be returned.
    blink::WebURL FindTappedContent(const blink::WebHitTestResult& hit_test);

protected:
    ContentDetector() { }

    // Parses the input string defined by the begin/end iterators returning true
    // if the desired content is found. The start and end positions relative to
    // the input iterators are returned in start_pos and end_pos.
    // The end position is assumed to be non-inclusive.
    virtual bool FindContent(const base::string16::const_iterator& begin,
        const base::string16::const_iterator& end,
        size_t* start_pos,
        size_t* end_pos,
        std::string* content_text)
        = 0;

    // Returns the intent URL that should process the content, if any.
    virtual GURL GetIntentURL(const std::string& content_text) = 0;

    // Returns the maximum length of text to be extracted around the tapped
    // position in order to search for content.
    virtual size_t GetMaximumContentLength() = 0;

    bool FindContentRange(const blink::WebHitTestResult& hit_test,
        std::string* content_text);

    DISALLOW_COPY_AND_ASSIGN(ContentDetector);
};

} // namespace content

#endif // CONTENT_RENDERER_ANDROID_CONTENT_DETECTOR_H_
